Power plant induced draft fan fault early warning method based on MSET and deviation degree

Abstract

The invention relates to a power plant induced draft fan fault early warning method based on MSET and deviation degree, and the method comprises the following steps: S1, obtaining multivariable data of an induced draft fan in a normal operation state, and building an MSET model; S2, obtaining an estimated vector Xest of the running state of the induced draft fan according to the MSET model; S3, calculating the deviation degree between the observation vector Xobs and the estimation vector Xest of the running state of the induced draft fan by utilizing a deviation degree function; and S4, comparing the deviation degree with a deviation degree threshold value to obtain a residual error, and determining whether to trigger an alarm according to the residual error. An MSET model is established through multivariable data of the induced draft fan in a normal operation state, and an optimal estimation value of model operation is obtained. The deviation degree function is used for judging the deviation degree between the actual value and the optimal estimated value, and the fault development process is reflected visually. The deviation degree is compared with a set threshold value to obtaina residual error, and an alarm is raised if the residual error is too large. Compared with the prior art, the method has the advantages of improving the early warning accuracy and timeliness and the like.

Description

technical field [0001] The invention relates to the technical field of early warning of induced draft fan failure, in particular to a method for early warning of induced draft fan failure in a power plant based on MSET and deviation degree. Background technique [0002] Power plant fan equipment is a large-scale rotating machinery equipment, which has the characteristics of complex structure, poor operating conditions and variable working conditions, and is prone to mechanical failures. In the actual operation of the thermal power plant, the working conditions of the induced draft fan are harsh, the conveying gas medium contains coal ash and unburned coal powder, the conveying impurities are large, and the failure rate is higher than other fans. More importantly, there are many types of induced draft fan failures. Once a failure occurs, the load of the unit will be reduced or unplanned shutdown, and the power generation of the unit connected to the grid will be reduced, maki...

AI Technical Summary

Problems solved by technology

The parameters monitored by the induced draft fan include vibration, temperature, and pressure, etc., and the parameters are related to each other, and they show different states under different working conditions. Therefore, relying on single-variable threshold monitoring will result in low failure warning accuracy.

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